CN106352271A - Backlight module and display device - Google Patents

Abstract

The invention discloses a kind of back light module, which includes a guide lighting unit and a luminescence unit. The guide lighting unit comprises at least a in-light surface and in-light surface connected to the bottom surface and out-light surface. The bottom surface and the out-light surface are relative surfaces, which are composed of a plurality of macro-structure units. Each macro-structure unit has multiple convex-concave structures and the out-light surface is provided with the first convex. The ray emitted by the luminescence unit is incident from in-light surface to guide lighting unit and is reflected by the out-light surface, wherein, the first convex extends respectively in the first direction and the convex-concave structures extends respectively in the second direction. The micro-structure unit in the second direction is discontinuous arrangement and the first direction is perpendicular to the second direction. The invention also discloses a kind of display device of backlight module. The backlight module and display device have the advantage of being thin, high vertical and low in cost.

Description

Backlight module and display unit

Technical field

The present invention is about a kind of backlight module and display unit, especially in regard to a kind of slimming, high collimation and lower costBacklight module and display unit.

Background technology

Along with scientific and technological progress, flat display apparatus has been used in various fields, especially liquid crystal display widelyDevice, because having, build is frivolous, low power consumption and the advantageous characteristic such as radiationless, has gradually replaced conventional cathodeRay tube display unit, and be applied in the electronic product of numerous species for example mobile phone, portable multimedia dressPut, notebook computer, LCD TV and LCD screen etc.

Liquid crystal indicator mainly comprises a display panels (LCD Panel) and a backlight module (BacklightModule), both are oppositely arranged. Backlight module can emit beam through display panels, and via liquid crystalShow each pixel display color of panel and form an image.

Known backlight module design generally comprises a light source, a LGP, a reflector plate and multiple blooming piece.Light source can emit beam and be incident to LGP by a side of LGP. Reflector plate is arranged at the bottom surface of LGP, with will be byThe light that bottom surface is penetrated is reflected back LGP again, to improve light utilization. In addition, the effect of LGP is guidingThe transmission direction of light, and by light in the total reflection of LGP inside, can make light be penetrated by the exiting surface of LGPGo out, more for example, after the described blooming piece (upper and lower diffusion sheet and upper and lower rhombus lens) of exiting surface can by being arranged atForm uniform area source, make display floater capable of displaying image. In addition, in order to improve product competitiveness, slimming,High collimation (highly-collimating) is that industry continues one of target of pursuing with the display unit of lower cost always.

Summary of the invention

Because above-mentioned, object of the present invention is for providing a kind of backlight module of novelty and the structural design of display unit.In one embodiment, backlight module and display unit can have advantages of slimming, high collimation and lower cost, and thenCan improve product competitiveness.

For reaching above-mentioned purpose, according to a kind of backlight module of the present invention, comprise a light element and a luminescence unit.A bottom surface and an exiting surface that light element has at least one incidence surface and is connected with incidence surface, bottom surface is phase with exiting surfaceEffects on surface, bottom surface comprises multiple microstructure units, and described microstructure unit has respectively multiple concaveconvex structures, and bright dippingMask has multiple the first protuberances. Luminescence unit emits beam and is incident to light element by incidence surface, and is penetrated by exiting surface;Wherein, described the first protuberance extends along a first direction respectively, and described concaveconvex structure extends along a second direction respectively,Described microstructure unit is discontinuous arrangement along second direction, and first direction is vertical in fact with second direction.

For reaching above-mentioned purpose, according to a kind of display unit of the present invention, comprise a display floater and a backlight module.Backlight module is relative with display floater and establish, and comprises a light element, a luminescence unit and a blooming piece, leaded lightA bottom surface and an exiting surface that unit has at least one incidence surface and is connected with incidence surface, bottom surface is phase his-and-hers watches with exiting surfaceFace, bottom surface comprises multiple microstructure units, and described microstructure unit has respectively multiple concaveconvex structures, and bright dipping maskHave multiple the first protuberances, described the first protuberance extends along a first direction respectively, and described concaveconvex structure is respectively along one secondDirection is extended, and described microstructure unit is discontinuous arrangement along second direction, and first direction and second direction are in factVertically, blooming piece is arranged between exiting surface and display floater, and has multiple the second protuberances, described the second protuberanceTowards exiting surface, and extend along second direction respectively, luminescence unit emits beam and is incident to light element by incidence surface,And penetrated by exiting surface.

In one embodiment, each described concaveconvex structure is respectively toward the recess of described light element inner side depression, and oneThe quantity of the described recess of microstructure unit is at least 2.

In one embodiment, one of them of described microstructure unit has one first width along first direction, and alongTwo directions have one second width, and the first width is between 40 microns and 200 microns, and the second width is between 40Micron and between 200 microns.

In one embodiment, the both sides of a concaveconvex structure have a side to light and a non-side to light, described side to light withAngle between first direction is more than or equal to 1 degree, and is less than or equal to 7 degree, the folder between non-side to light and first directionAngle is greater than 0 degree, and is less than 90 degree.

In one embodiment, each described the first protuberance has respectively one first drift angle, and the angle of the first drift angle is more than or equal to56.2 degree, and be less than or equal to 105.4 degree.

In one embodiment, backlight module more comprises a blooming piece, and itself and exiting surface are oppositely arranged, blooming piece toolHave multiple the second protuberances, described the second protuberance is towards exiting surface, and extends along second direction respectively.

In one embodiment, each described the second protuberance has respectively one second drift angle towards exiting surface, the second drift angleAngle is more than or equal to 60.6 degree, and is less than or equal to 70.6 degree.

In one embodiment, blooming piece fits in display floater by an adhesion coating.

In one embodiment, adhesion coating is an optical cement.

From the above, in foundation backlight module of the present invention and display unit, the bottom surface of light element comprises multiple micro-Construction unit, described microstructure unit has respectively multiple concaveconvex structures, and exiting surface has multiple the first protuberances. SeparatelyOutward, described the first protuberance extends along a first direction respectively, and described concaveconvex structure extends along a second direction respectively,Described microstructure unit is discontinuous arrangement along second direction, and first direction is vertical in fact with second direction. Pass throughThe structural design of described novelty, in one embodiment, compared to the design of known backlight module, in the present inventionLight element is except having the design of microstructure unit and the first protuberance, more as long as collocation one blooming piece just can make to penetrateThe light that goes out backlight module reaches the object of high collimation. In addition, also because only use a slice blooming piece leaded light of arranging in pairs or groups againThe structure of unit, thus can make backlight module and display unit there is slimming and lower cost, and then can improveProduct competitiveness.

Brief description of the drawings

Fig. 1 is the schematic diagram of a kind of display unit of preferred embodiment of the present invention.

Fig. 2 A is the schematic diagram of the backlight module in the display unit shown in Fig. 1.

Fig. 2 B is light element in the backlight module shown in Fig. 2 A and the elevational schematic view of luminescence unit.

Fig. 2 C is light element in the backlight module shown in Fig. 2 A and the schematic side view of luminescence unit.

Fig. 2 D is that another implements the light element of aspect and the schematic side view of luminescence unit.

Fig. 3 A is the schematic side view of microstructure unit.

Fig. 3 B is that light passes through, after the reflection and refraction of microstructure unit, to penetrate the schematic diagram of exiting surface.

Fig. 3 C is the schematic diagram of light via the first protuberance refraction of light element.

Fig. 3 D is that light penetrates light element the schematic diagram through blooming piece refraction.

Fig. 4 is the optical strength distribution schematic diagram of the backlight module of preferred embodiment of the present invention.

Detailed description of the invention

Hereinafter with reference to relevant drawings, backlight module and display unit according to preferred embodiment of the present invention are described, Qi ZhongxiangSame element will be illustrated with identical reference marks.

Please refer to shown in Fig. 1, Fig. 2 A to Fig. 2 C, wherein, the one that Fig. 1 is preferred embodiment of the present invention showsThe schematic diagram of device 1, Fig. 2 A is the schematic diagram of the backlight module 3 in the display unit 1 shown in Fig. 1, Fig. 2 BFor the light element 31 in the backlight module 3 shown in Fig. 2 A and the elevational schematic view of luminescence unit 32, and Fig. 2 CFor the light element 31 in the backlight module 3 shown in Fig. 2 A and the schematic side view of luminescence unit 32.

Display unit 1 comprises a display floater 2 and a backlight module 3, and backlight module 3 is relative with display floater 2And establish, and can emit beam by display floater 2, make display floater 2 show images. In order to help to understand the present invention,In diagram, show a first direction X, a second direction Y and a third direction Z, first direction X, second directionY and third direction Z are in fact mutually vertical between two. Wherein, first direction X for example with the sweeping of display floater 2The bearing of trend of retouching line is parallel in fact, and second direction Y is for example real with the bearing of trend of the data line of display floater 2Parallel in matter, and third direction Z is the other direction of vertical first direction X and second direction Y. In addition, showPanel 2 can be fringe field and switches (Fringe Field Switching, FFS) type display panels, or as waterTruncation is remodeled (In Plane Switching, IPS) or as stable twisted nematic (Twisted Nematic, TN) liquidLCD panel, or vertical orientation type (Vertical Alignment, VA) type display panels, or its alloytypeThe liquid crystal indicator of formula, does not limit.

Display floater 2 has a first substrate 21, a second substrate 22, a liquid crystal layer (figure does not show) and two inclined to one sideTabula rasa 23,24. First substrate 21 is oppositely arranged with second substrate 22, and liquid crystal layer is folded in first substrate 21And between second substrate 22. The first substrate 21 of the present embodiment is with thin film transistor base plate, and second substrate 22 isTaking colored optical filtering substrates as example. But, in other enforcement aspect, the black-matrix layer on colored optical filtering substrates(black matrix) and filter layer also can be arranged at respectively on thin film transistor base plate, and first substrate 21 is becomeOne BOA (BM on array) substrate, or become a COA (color filter on array) substrate, do not limit.

Polarizer 23 is Polarizer, and Polarizer 24 is Polarizer on. Wherein, Polarizer 23 is (partially lowerTabula rasa) be arranged at the side of first substrate 21 away from second substrate 22, Polarizer 24 (upper Polarizer) is arranged atSecond substrate 22 is away from a side of first substrate 21. In this, Polarizer 23 is the downsides that are arranged at first substrate 21Surface, and Polarizer 24 is the uper side surfaces that are arranged at second substrate 22. Differ in fact by two polarizing axisThe Polarizer 23,24 of 90 degree, can reach the function that backlight is covered, and the power of recycling control electric field can be rightLiquid crystal produces deflection with the characteristic of modulation light, reaches to allow the object of display floater 2 show images.

As shown in Figure 2 A and 2 B, backlight module 3 comprises a light element 31 and a luminescence unit 32. In addition,The backlight module 3 of the present embodiment more comprises a blooming piece 33 and a reflecting element 34. Light element 31 have toA few incidence surface I and a bottom surface B who is connected with incidence surface I and an exiting surface O, bottom surface B and exiting surface O are phaseTo two surfaces that arrange. Wherein, incidence surface I is the surface of light incident light element 31, and exiting surface OBe the surface that light leaves light element 31. In this, incidence surface I is a side of light element 31, and bright dippingFace O is the uper side surface of light element 31, and making backlight module 3 is a side-mounted backlight module. Light element 31Effect be to guide the transmission direction of light, and by light in the total reflection of light element 31 inside, make lightExiting surface O by light element 31 penetrates. Light element 31 is to make with light transmissive material, and light transmissive material for exampleCan be acrylic resin, Merlon, polyvinyl resin or glass, do not limited. In addition, light element31 section shape can be for example tabular or wedge shape. In this, be taking flat light element 31 as example.

The bottom surface B of light element 31 comprises multiple microstructure units 311, and described microstructure unit 311 is along second partyBe discontinuous arrangement (or claiming to be random alignment along second direction Y) to Y, and each microstructure unit 311 respectivelyThere are multiple concaveconvex structures (figure does not indicate). In this, " being discontinuous arrangement along second direction Y " refer to, described inMicrostructure unit 311 does not have certain rule along the arrangement mode of second direction Y, and two adjacent micro-knotsDistance between structure unit 311 can be identical or not identical. In addition, the quantity of each row's microstructure unit 311 also can phaseSame or not identical, all do not limit.

In addition, the exiting surface O of light element 31 has multiple the first protuberances 313, and described the first protuberance 313 respectivelyExtend along first direction X. And the described concaveconvex structure of each microstructure unit 311 prolongs along second direction Y respectivelyStretch, and first direction X is vertical in fact with second direction Y. In the present embodiment, as shown in Fig. 2 A to Fig. 2 C,Described first protuberance 313 of the present embodiment is the continuous protuberance that shape is identical, and extends toward first direction X respectively,And each concaveconvex structure of each microstructure unit 311 is respectively toward the recess U of light element 31 inner sides depressions,And it (is prolonging of each recess U that described recess U extends toward the second direction Y vertical in fact with first direction X respectivelyStretching direction is second direction Y), that is both bearing of trends are mutually vertical. But, in different enforcement aspects,Each concaveconvex structure of each microstructure unit 311 also can be respectively outstanding toward light element 31 outsides and (leave leaded lightThe direction of unit 31) protuberance V (as shown in Figure 2 D), and described protuberance V is respectively toward real with first direction XSecond direction Y vertical in matter extends. The concaveconvex structure that the present invention does not limit microstructure unit 311 is past leaded lightThe outstanding structure of unit 31 inner side depression or past light element 31 outsides.

The first protuberance 313 can be positive water chestnut mirror or semicylindrical lens (Lenticular). In this, be with the first protuberance 313For positive water chestnut mirror is example. In addition, the quantity of the described recess U of each microstructure unit 311 is at least 2. In this,As shown in Fig. 2 B and Fig. 2 C, be quantity taking the described recess U of each microstructure unit 311 as 3 as example,And between two adjacent recesses U, have a protuberance V (quantity of the protuberance V of the present embodiment is 2,Protuberance V also extends along second direction Y). In addition, one of them of described microstructure unit 311 is along first directionX has one first width L, and has one second width W along second direction Y, and the first width L can be micro-between 40Rice and between 200 microns, and the second width W also can be between 40 microns and 200 microns. In one embodiment,The first width L is 160 microns, and the second width W is 160 microns.

Luminescence unit 32 is adjacent to incidence surface I, and can emit beam and be incident to light element 31 by incidence surface I, andExiting surface O by light element 32 penetrates, and through blooming piece 33 and display floater 2. The present embodiment luminousUnit 32 has at least one light-emitting component 321 and a substrate 322, and light-emitting component 321 is relative with incidence surface I and establish (twoPerson can contact or not contact), and be arranged on substrate 322. Substrate 322 can be flexible base plate, rigid substrate or softScleroma plywood, does not limit. The light-emitting component 321 of the present embodiment is light emitting diode, and such as but not limited to tableFace adhering technical (Surface Mount Technology, SMT) is arranged on substrate 322. In addition, the present embodimentLuminescence unit 32 be the LED optical strip (lightbar) with multiple light emitting diodes be example, and arrangeIn a side of light element 31. But, in different embodiment, also can be in the incidence surface I of light element 31 phaseA right surface separately arranges a luminescence unit (figure does not show), so that two luminescence units 31 can be respectively by relative both sidesIncidence surface I inject light to light element 31, the present invention does not limit.

Reflecting element 34 is arranged at the bottom surface B of light element 31, and the light being penetrated by bottom surface B can be reflexed to againThe inside of light element 31. Wherein, reflecting element 34 can be a reflecting layer (being for example the coat of metal) or a reflectionSheet, in this, reflecting element 34 is taking a reflector plate as example, and its thickness is less than the thickness of light element 31. In addition,Reflecting element 34 can have reflecting material, and reflecting material for example can comprise metal, metal oxide, high reflection paint(white paint) or its combination, do not limit.

Hold, in the present embodiment, the structural design of the microstructure unit 311 by light element 31, can make to penetrateThe light that goes out the exiting surface O of light element 31 (penetrates the radiation direction of exiting surface O toward direction deviation with great visual angleCan be greater than for example 65 ° with the angle of third direction Z), to reach the object of wide-angle bright dipping. In addition, the present embodimentAlso by the structural design of microstructure unit 311, can make the light that penetrates exiting surface O in the upper light harvesting of first direction XLight beam (allowing light beam concentrate in first direction X is upper). In addition, when light penetrates leaded light list through the first protuberance 313Unit 31 o'clock, the first protuberance 313 can make the light penetrating (allow light beam in second party in the upper light harvesting light beam of second direction YConcentrate to Y is upper).

Shown in Fig. 1 and Fig. 2 A, in the present embodiment, blooming piece 33 with exiting surface O to arranging,And thering are multiple the second protuberances 331, described the second protuberance 331 is towards exiting surface O, and prolongs along second direction Y respectivelyStretch. In this, blooming piece 33 is an inverse edge eyeglass, and fits in the polarisation of display floater 2 by an adhesion coating 35Plate 23 (lower Polarizer). Wherein, adhesion coating 35 is for having an optical cement (OCA, the Optical of light diffusion propertyClear Adhesive), making can be more even by the light of blooming piece 33. In the present embodiment, also pass through lightLearn the design of diaphragm 33, making becomes high collimated ray through the light of blooming piece 33.

Below, please refer to shown in Fig. 3 A to Fig. 3 D, to describe micro-knot of light element 31 of backlight module 3 in detailThe structural design of the second protuberance 331 of structure unit 311, the first protuberance 313 and blooming piece 33 and light are by upperState the effect producing after element. Wherein, the schematic side view of the microstructure unit 311 that Fig. 3 A is above-described embodiment,Fig. 3 B is that light passes through, after the reflection and refraction of microstructure unit 311, to penetrate the schematic diagram of exiting surface O, Fig. 3 CThe schematic diagram reflecting via the first protuberance 313 of light element 31 for light, and Fig. 3 D to be light penetrate leaded light listUnit 31 schematic diagram reflecting through blooming piece 33.

As shown in Figure 3A, in microstructure unit 311, the both sides tool of a concaveconvex structure (being recess U in this)There are a side to light and a non-side to light (or claiming backlight face). In this, so-called " side to light " is exactly a recess U'sIn two surfaces (two surfaces form a recess U), near the surface of (facing) light-emitting component 321, and " non-Side to light " be another surface away from from light-emitting component 321. Suppose that, in Fig. 3 A, light-emitting component 321 is micro-, surperficial S1 is side to light when in the left side of construction unit 311, and surperficial S2 is non-side to light. Wherein, meet(acute angle, i.e. θ can shape between light face (S1) and first direction X have angle₁、θ₃、θ₅). In order to make to penetrateThe light of exiting surface O reaches with great visual angle and concentrated light bag, in the microstructure unit 311 of the present embodiment, and this folderAngle (θ₁、θ₃、θ₅)) need be more than or equal to 1 degree, and be less than or equal to 7 degree. In addition, non-side to light (S2) withThe angle of first direction X (is θ₂、θ₄、θ₆) be greater than 0 degree, and be less than 90 degree. Wherein, preferably meetLight face angle is for example 5 °. In addition, the angle forming between each recess U and first direction X not necessarilyIdentical (θ₁、θ₃、θ₅Can be identical or not identical, θ₂、θ₄、θ₆Can be identical or not identical, do not limit).In addition, between two recess U of the present embodiment, can form a protuberance V, protuberance V's (or recess U)Radius of curvature also limits and is more than or equal to 1 μ m, and is less than or equal to 50 μ m. In addition, in microstructure unit 311,Its height H₁、H₂、H₃Also limit and be greater than 1 micron, and height h₁、h₂Also limit and be greater than 0.

In the present embodiment, N (n) equals 3 (a microstructure unit 311 has 3 recess U), utilizesThe relevant mathematical expression of microstructure unit 311 that trigonometric function and the relation of slope can be found out light element 31 is as follows:

1、∵And ${\mathrm{tan\θ}}_2=\frac{H_1}{b_2}\⇒b_2=\frac{H_1}{{\mathrm{tan\θ}}_2}$ ∴ $B_n=\frac{H_n}{{\mathrm{tan\θ}}_n}+\frac{H_n}{{\mathrm{tan\θ}}_{n+1}}=b_1+b_2$ Obtain by that analogy B₂、B₃…B_n

2、∵ ${\mathrm{tan\θ}}_3=\frac{h_1}{a_1}\⇒a_1=\frac{h_1}{{\mathrm{tan\θ}}_3}$ And ${\mathrm{tan\θ}}_2=\frac{h_1}{a_2}\⇒a_2=\frac{h_1}{{\mathrm{tan\θ}}_2}$ ∴ $A_n=\frac{h_n}{{\mathrm{tan\θ}}_{n+2}}+\frac{h_n}{{\mathrm{tan\θ}}_{n+1}}=a_1+a_2$ Obtain by that analogy A₂…A_n

3、L＝(B₁-A₁)+(B₂-A₂)+...+(B_N-A_N)+B_N

By by that analogy above-mentioned, can obtain: $L=\underset{n=1}{\overset{N}{\Σ}}{B}_n-A_{n-1},$ Make A₀＝0

In addition, light reflects via the microstructure unit 311 of light element 31 and the principle of refraction can be as Fig. 3 BShown in. Wherein, θ_a: the supplementary angles of angle of incidence of light. θ_b: in the time that light is incident upon microstructure unit 311 and its methodThe angle of line; Wherein, work as angle theta_bWhile being less than critical angle, light can penetrate bottom surface B, and penetrates bottom surface B'sLight can be reflected into light element 31 again via reflecting element 34; Work as angle theta_bBe greater than critical angle, light can quiltMicrostructure unit 311 total reflections. θ_c: work as angle theta_bWhile being greater than critical angle, light total reflection direction and first directionAngle between X. θ_d: the angle of the normal of the radiation direction in light element 31 and exiting surface O, and work as angle θ_dWhile being less than critical angle, light can reflect exiting surface O, but works as angle theta_dWhile being greater than critical angle, light meetingContinue at and in light element 31, carry out total reflection. In addition, θ is that light is while penetrating exiting surface O and normal (third partyTo Z) angle. Wherein, when the surface that light is encountered microstructure unit 311 is that negative slope (is that light is beaten and met lightWhen face) time, angle of reflection can reduce by 2 times of θ n; When the surface that light is encountered microstructure unit 311 be positive slope (Light is beaten in the time of non-side to light) time, angle of reflection can increase by 2 times of θ n. Below, be that light is got to microstructure unitCalculating formula when 311 surface (side to light) is negative slope:

${\mathrm{\θ}}_b=\frac{\mathrm{\π}}{2}-{\sin }^{-1}\left(\frac{1}{n}\right)-{\mathrm{\θ}}_n$

$\begin{array}{c}{\mathrm{\θ}}_c=\mathrm{\π}-2{\mathrm{\θ}}_b-{\mathrm{\θ}}_i\\ ={\sin }^{-1}\left(\frac{1}{n}\right)+2{\mathrm{\θ}}_n\end{array}$

$\begin{array}{c}{\mathrm{\θ}}_d=\frac{\mathrm{\π}}{2}-{\mathrm{\θ}}_c\\ =\frac{\mathrm{\π}}{2}-{\sin }^{-1}\left(\frac{1}{n}\right)-2{\mathrm{\θ}}_n\end{array}$

$\mathrm{\θ}={\sin }^{-1}\left(n\×cos\left({\sin }^{-1}\left(\frac{1}{n}\right)+2{\mathrm{\θ}}_n\right)\right)---(1-a)$

In addition, the calculating formula of the surface (non-side to light) that light is got to microstructure unit 311 during for positive slope is:

${\mathrm{\θ}}_b=\frac{\mathrm{\π}}{2}-{\sin }^{-1}\left(\frac{1}{n}\right)+{\mathrm{\θ}}_n$

${\mathrm{\θ}}_c=\mathrm{\π}-2{\mathrm{\θ}}_b-{\sin }^{-1}\left(\frac{1}{n}\right)$

$={\sin }^{-1}\left(\frac{1}{n}\right)-2{\mathrm{\θ}}_n$

$\begin{array}{c}{\mathrm{\θ}}_d=\frac{\mathrm{\π}}{2}-{\mathrm{\θ}}_c\\ =\frac{\mathrm{\π}}{2}-{\sin }^{-1}\left(\frac{1}{n}\right)+2{\mathrm{\θ}}_n\end{array}$

$\mathrm{\θ}={\sin }^{-1}\left(n\×cos\left({\sin }^{-1}\left(\frac{1}{n}\right)-2{\mathrm{\θ}}_n\right)\right)---(1-b)$

Then, as shown in Figure 3 C, in the time obtaining reflecting and penetrating the angle θ of exiting surface O by microstructure unit 311,Can push back to not penetrating the light of light element 31 and the angle of its normal and (the positive water chestnut of the first protuberance 313 below substitutionMirror) relevant formula (2), just can obtain the scope of the optimum solution of the first drift angle ψ of the first protuberance 313. Wherein,Each described the first protuberance 313 has respectively the one first drift angle ψ away from exiting surface O, and the present invention limits each describedThe angle of the first drift angle ψ of one protuberance 313 is more than or equal to 56.2 degree, and is less than or equal to 105.4 degree (56.2 °≤ψ ≦105.4°)。

Relevant calculating formula is as follows. In this, n₁For the refractive index of light element 31, and n₂For the refraction of airRate (=1). In addition, θ₁: light reflect via microstructure unit 311 and with the angle of third direction Z, θ_i: lightLine is refracted into firing angle, θ via microstructure unit 311 and the first protuberance 313_t: light penetrates the first protuberance 313The angle of emergence.

∵ ${\mathrm{\θ}}_i=\frac{(\mathrm{\π}-\mathrm{\ψ})}{2}-{\mathrm{\θ}}_1;{\mathrm{\θ}}_t=\frac{(\mathrm{\π}-\mathrm{\ψ})}{2};{\mathrm{\θ}}_t={\mathrm{\θ}}_1+{\mathrm{\θ}}_i$

And n₁sinθ_i＝n₂sinθ_t(n₂＝air n₁＝LGP)

$\⇒n_{1}sin({\mathrm{\θ}}_t-{\mathrm{\θ}}_1)=n_2{\mathrm{sin\θ}}_t$

$\⇒{\mathrm{sin\θ}}_t{\mathrm{cos\θ}}_1-{\mathrm{cos\θ}}_t{\mathrm{sin\θ}}_1=\frac{n_2}{n_1}{\mathrm{sin\θ}}_t$

$\⇒{\mathrm{tan\θ}}_t{\mathrm{cos\θ}}_1-{\mathrm{sin\θ}}_1=\frac{n_2}{n_1}{\mathrm{tan\θ}}_t$

$\⇒{\mathrm{sin\θ}}_1=\left(cos\mathrm{\θ}-\frac{n_2}{n_1}\right){\mathrm{tan\θ}}_t$

$\⇒{\mathrm{\θ}}_t={\tan }^{-1}\[\frac{n_1{\mathrm{sin\θ}}_1}{(n_1{\mathrm{cos\θ}}_1-n_2)}\]$

∴ $\mathrm{\ψ}=2\×\left(\frac{\mathrm{\π}}{2}-{\tan }^{-1}\[\frac{n_1{\mathrm{sin\θ}}_1}{(n_1{\mathrm{cos\θ}}_1-n_2)}\]\right)---\left(2\right)$

After microstructure unit 311 reflections, penetrate the folding of light element 31 from obtaining light above formula (1-a), (1-b)Firing angle degree θ, then via following formula (3), as shown in Figure 3 D, can find one second of the second protuberance 331 preferablyDrift angle Φ, can make the high angle scattered light that penetrates exiting surface O can be directed to direction of collimation (third direction Z) thus. ItsIn, each described second protuberance 331 of blooming piece 33 has respectively the second drift angle Φ towards exiting surface O, and thisThe angle that invention also limits the second drift angle Φ is more than or equal to 60.6 degree, and be less than or equal to 70.6 degree (60.6 ° ≦ Φ≤70.6 °). In addition, in formula (3), n₁For the refractive index (=1) of air, n₂For the refractive index of blooming piece 33,C is offset, and n is the refractive index of light element 31.

${\mathrm{\θ}}_i=\frac{(\mathrm{\Φ}-\mathrm{\π})}{2}+\mathrm{\θ}$

${\mathrm{\θ}}_t=\frac{(3\mathrm{\Φ}-\mathrm{\π})}{2}$

θ_t＝π+3θ_i-3θ

n₁sinθ_i＝n₂sinθ_t

$\⇒n_1{\mathrm{sin\θ}}_i=n_{2}sin(\mathrm{\π}+3{\mathrm{\θ}}_i-3\mathrm{\θ})$

∵ $\mathrm{\θ}=\left({\sin }^{-1}\left(n\×cos\left({\sin }^{-1}\left(\frac{1}{n}\right)+2{\mathrm{\θ}}_n\right)\right)\right)+C$

∴ $n_{1}sin\left(\frac{(\mathrm{\Φ}-\mathrm{\π})}{2}+\left(\left({\sin }^{-1}\left(n\×cos\left({\sin }^{-1}\left(\frac{1}{n}\right)+2{\mathrm{\θ}}_n\right)\right)\right)+C\right)\right)$

$=n_2\sin \left(\begin{array}{c}\mathrm{\π}+3\×\left(\frac{\mathrm{\Φ}-\mathrm{\π}}{2}+\left(\left({\sin }^{-1}\left(n\×\cos \left({\sin }^{-1}\left(\frac{1}{n}\right)+2{\mathrm{\θ}}_n\right)\right)\right)+C\right)\right)\\ -3\left(\left({\sin }^1\left(n\×\cos \left({\sin }^1\left(\frac{1}{n}\right)+2{\mathrm{\θ}}_n\right)\right)\right)+C\right)\end{array}\right)---\left(3\right)$

After the actual size data of the microstructure unit 311 of substitution light element 31, carry out above-mentioned formula for testingCard, can obtain in the microstructure unit 311 of light element 31 surface of recess U (S1, S2) and first directionThe preferred angle of the angle forming between X (is θ₁、…、θ₆) be respectively 5 °, and the first protuberance 313The first drift angle ψ is 95.9 °, and the second drift angle Φ of the second protuberance 331 is 65.6 °.

Please refer to shown in Fig. 4 the optical strength distribution schematic diagram of its backlight module 3 that is preferred embodiment of the present invention.In this, (be θ with above-mentioned angle₁、…、θ₆) being respectively 5 °, the first drift angle ψ of the first protuberance 313 is 95.9°, and the second drift angle Φ of the second protuberance 331 is under the condition of 65.6 °, the optical strength distribution map obtaining.

By finding in Fig. 4, the quite little (lighting angle of light bag of the light that the backlight module 3 of the present embodiment sendsQuite little), really can reach the high effect that collimates bright dipping.

Therefore, be provided with multiple blooming pieces (for example upper and lower diffusion sheet and upper and lower water chestnut compared to known backlight moduleEyeglass) design, the light element 31 of the present embodiment is except having microstructure unit 311 and the first protuberance 313Design outside, more reach high and collimate as long as blooming piece 33 of collocation just can make to penetrate the light of backlight module 3Object. In addition, the present embodiment is also because only use arrange in pairs or groups the again structure of light element 31 of a slice blooming piece 33, thereforeCan make backlight module 3 and display unit 1 there is slimming and lower cost, and then can improve product competitiveness.

One carrying, in the assembling process of the display unit 1 of the present embodiment, is by the blooming of backlight module 3 againSheet 33 directly fits on the lower Polarizer 23 of display floater 2, therefore, in automated production, can more reach letterEasily and the assembling of accuracy, and then can promote packaging efficiency.

In sum, in backlight module of the present invention and display unit, the bottom surface of light element comprises multiple micro-knotsStructure unit, described microstructure unit has respectively multiple concaveconvex structures, and exiting surface has multiple the first protuberances. In addition,Described the first protuberance extends along a first direction respectively, and described concaveconvex structure extends along a second direction respectively, described inMicrostructure unit is discontinuous arrangement along second direction, and first direction is vertical in fact with second direction. By describedNovel structural design, in one embodiment, compared to the design of known backlight module, light element is except toolHave outside the design of microstructure unit and the first protuberance, more as long as collocation one blooming piece just can make to penetrate the light of backlight moduleLine reaches the object of high collimation. In addition, also because only use arrange in pairs or groups the again structure of light element of a slice blooming piece, thereforeCan make backlight module and display unit there is slimming and lower cost, and then can improve product competitiveness.

The foregoing is only illustrative, but not be restricted person. Anyly do not depart from spirit of the present invention and category, and rightThe equivalent modifications that it carries out or change, in the claims that all should be contained in.

Claims (10)

1. a backlight module, is characterized in that, comprising:

One light element, the bottom surface and the exiting surface that there is at least one incidence surface and be connected with described incidence surface, described inBottom surface and described exiting surface are apparent surface, and described bottom surface comprises multiple microstructure units, and described microstructure unit respectivelyHave multiple concaveconvex structures, described exiting surface has multiple the first protuberances; And

One luminescence unit, emits beam and is incident to described light element by described incidence surface, and is penetrated by described exiting surface;

Wherein, described the first protuberance extends along a first direction respectively, and described concaveconvex structure prolongs along a second direction respectivelyStretch, and described microstructure unit is discontinuous arrangement along described second direction described first direction and described second directionVertical in fact.

2. backlight module as claimed in claim 1, is characterized in that, each described concaveconvex structure be respectively toward described inThe recess of light element inner side depression, and the quantity of the described recess of a microstructure unit is at least 2.

3. backlight module as claimed in claim 1, is characterized in that, one of them edge of described microstructure unitDescribed first direction has one first width, and has one second width along described second direction, and described the first width is situated betweenBetween 40 microns and 200 microns, described the second width is between 40 microns and 200 microns.

4. backlight module as claimed in claim 1, is characterized in that, the both sides of a concaveconvex structure have meetsLight face and a non-side to light, the angle between described side to light and described first direction is more than or equal to 1 degree, and be less than etc.In 7 degree, the angle between described non-side to light and described first direction is greater than 0 degree, and is less than 90 degree.

5. backlight module as claimed in claim 1, is characterized in that, each described the first protuberance has respectively oneOne drift angle, the angle of described the first drift angle is more than or equal to 56.2 degree, and is less than or equal to 105.4 degree.

6. backlight module as claimed in claim 1, is characterized in that, more comprises:

One blooming piece, is oppositely arranged with described exiting surface, and described blooming piece has multiple the second protuberances, instituteState the second protuberance towards described exiting surface, and extend along described second direction respectively.

7. backlight module as claimed in claim 6, is characterized in that, each described the second protuberance have respectively towardsOne second drift angle of described exiting surface, the angle of the second drift angle is more than or equal to 60.6 degree, and is less than or equal to 70.6 degree.

8. a display unit, is characterized in that, comprising:

One display floater; And

One backlight module, relative with described display floater and establish, and comprise a light element, a luminescence unit and a lightLearn diaphragm, a bottom surface and an exiting surface that described light element has at least one incidence surface and is connected with described incidence surface,Described bottom surface and described exiting surface are apparent surface, and described bottom surface comprises multiple microstructure units, described microstructure unitHave respectively multiple concaveconvex structures, described exiting surface has multiple the first protuberances, and described the first protuberance is respectively along one firstDirection is extended, and described concaveconvex structure extends along a second direction respectively, and described microstructure unit along described second direction isDiscontinuous arrangement, and described first direction is vertical in fact with described second direction, described in described blooming piece is arranged atBetween exiting surface and described display floater, and have multiple the second protuberances, described the second protuberance is towards described exiting surface,And extend along described second direction respectively, described luminescence unit emits beam and is incident to described leaded light list by described incidence surfaceUnit, and penetrated by described exiting surface.

9. display unit as claimed in claim 8, is characterized in that, described blooming piece is by an adhesion laminatingClose in described display floater.

10. display unit as claimed in claim 9, is characterized in that, described adhesion coating is an optical cement.